Only valid for active forum users. Active means at least 30 postings within the last 30 days (no spam postings). This will automatically being checked at www.starbike.com shopping basket so make sure that you are logged in at the WW board!If there does not appear a WW discount position when you check out you do not have enough postings!

the first looks like the s900/s950 crankset, as above this has a removable spider making the cranks usable for powermeters

s950 is 110bcd, s900 is 130bcd, cranks/spindle are the same, the spindle is bb30/bb30a/pf30 compatible, only the spider differs, the cranksets come with various spacers and have the integrated adjuster

Hexsense wrote:First one is BB386 Quarq power meter ready version. It is heavier.

Second one is BB30 (and PF30) specific version. this is lighter with non-removable spider.

This is the most important point for you - the spindle size determines the compatibility with your frame. The top BB386 crank has a spindle that is wider than your frame (86mm wide x 30mm diameter) and will either require spacers on both sides of the bottom bracket or an alternative bottom bracket to widen the bearings from the body of your frame, which is 73mm wide. The second crank has a 68mm x 30mm spindle and (edit) WILL fit your frame using the method described in the thread linked 2 posts below.

You specified a "BB30a" bottom bracket, which I think means that you're looking for an 86mm x 30 or 24mm spindle that will fit adapters that press into the frame to widen the bottom bracket area from 73mm to 86mm width. For this type of bottom bracket, you would need a SRAM Force style BB30 crank (the top photo), any SRAM GXP or any modern Shimano crank with hollowtech spindle.

Last edited by rideintospace on Sat May 06, 2017 10:00 pm, edited 1 time in total.

rideintospace wrote:The second crank has a 68mm x 30mm spindle and will NOT fit your frame.

This is not correct. Both cranks will fit in your frame. The top one you can remove the 5mm NDS spacer and use the threaded preload adjuster. The bottom one you can remove the threaded preload adjuster and use plastic shims and a wave washer like Valbrona mentioned.

The second one is much lighter. The first one is also not the same as Force but it is close. The first one is hollow (Exogram) while the Force version is not.

The only reason to go with the top one is if you're going to eventually use a powermeter or you want to use it on a BB386 frame.

rideintospace wrote:The second crank has a 68mm x 30mm spindle and will NOT fit your frame.

This is not correct. Both cranks will fit in your frame. The top one you can remove the 5mm NDS spacer and use the threaded preload adjuster. The bottom one you can remove the threaded preload adjuster and use plastic shims and a wave washer like Valbrona mentioned.

The second one is much lighter. The first one is also not the same as Force but it is close. The first one is hollow (Exogram) while the Force version is not.

The only reason to go with the top one is if you're going to eventually use a powermeter or you want to use it on a BB386 frame.

Thank you for the correction - I read this thread which gave a good explanation.